Which region the game was bought in. A cheaper region is the whole point, but some games are locked to it and will not run from Pakistan.
Whether you get a key, a gift, or an account. A key is yours forever; an account stays the seller's, and you are borrowing it.
If it is an account: whether it works offline only. An offline account cannot be taken online without the seller's password, and going online can end it.
Whether anyone else is using the same account. Shared accounts get locked when two people play at once.
That the seller is here and answering before you pay. Delivery on these is by hand, and a seller who is asleep is a seller who has not sent it.
